@book{92123,
	author = {Potter, David Morris. and Fehrenbacher, Don E.},
	title = {The impending crisis, 1848-1861 /},
	publisher = {Harper & Row,},
	year = {c1976.},
	series = {The New American Nation series},
	address = {New York :},
	edition = {1st ed.},
	note = {Includes index.}
}